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Topic: 455 with HEI timing (Read 213 times)

Just looking for some input on my 455 olds. 70 block,e heads(iron), hei distributor. My question is in regards to timing. I presently have 18 initial with ported line to distributor plugged.35 degrees at 3500 rpm with mechanical in. 56-57 degrees all in with vacuum line attached. Do I have to much vacuum advance? Should I decrease initial and increase mechanical. I feel the motor has much more to offer up to the tire gods.Thanks